The unit includes an intelligent system that communicates malfunctions through specific LED blinking patterns
Use a soft brush to remove dust from the aluminum fins. york ywm15l-amlda manual
Look at the manual’s “Mode” button options. If “Heat” is an option, it is a heat pump model. Many 15L units are “cool only” unless specified as “YWM15L-AMlDA/H.” Verify your manual. The unit includes an intelligent system that communicates
located under the front panel of the indoor unit that allows it to run in "Auto" mode. YORK® Air-Conditioning Systems york ywm15l-amlda manual